netdev - Re: [PATCH 2/2] drivers/net: fixed drivers that support netpoll use ndo_start

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Date:	Fri, 21 Aug 2009 10:26:19 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	DDD <Dongdong.deng@...driver.com>
Cc:	David Miller <davem@...emloft.net>, Nicolas Pitre <nico@....org>,
	lkml <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	Jason Wessel <jason.wessel@...driver.com>
Subject: Re: [PATCH 2/2] drivers/net: fixed drivers that support netpoll
 use ndo_start_xmit()

On Fri, 2009-08-21 at 21:34 +0800, DDD wrote:
> The NETPOLL API requires that interrupts remain disabled in
> netpoll_send_skb(). The use of "A functions set" in the NETPOLL API
> callbacks causes the interrupts to get enabled and can lead to kernel
> instability.
> 
> The solution is to use "B functions set" to prevent the irqs from
> getting enabled while in netpoll_send_skb().
> 
> A functions set:
> local_irq_disable()/local_irq_enable()
> spin_lock_irq()/spin_unlock_irq()
> spin_trylock_irq()/spin_unlock_irq()
> 
> B functions set:
> local_irq_save()/local_irq_restore()
> spin_lock_irqsave()/spin_unlock_irqrestore()
> spin_trylock_irqsave()/spin_unlock_irqrestore()
> 
> Signed-off-by: Dongdong Deng <dongdong.deng@...driver.com>

Both of these look good to me, thanks.

Acked-by: Matt Mackall <mpm@...enic.com>

-- 
http://selenic.com : development and support for Mercurial and Linux


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